Add note about the changed paswords when installing.

[CarlosALgit]

Description

Related: https://github.com/wazuh/wazuh-packages/issues/2883

The objective of this PR is to notify the user that the passwords of the wazuh and wazuh-wui users have been changed after the installation.

In addition, we provide the user the necessary command to view all the passwords.

Finally, the result is the following one: